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Combinatorial doping of TiO_2 with platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni) to achieve enhanced photocatalytic activity with visible light irradiation

Choi, Jina and Park, Hyunwoong and Hoffmann, Michael R. (2010) Combinatorial doping of TiO_2 with platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni) to achieve enhanced photocatalytic activity with visible light irradiation. Journal of Materials Research, 25 (1). pp. 149-158. ISSN 0884-2914. http://resolver.caltech.edu/CaltechAUTHORS:20100216-135225451

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Abstract

Titanium dioxide (TiO_2) was doped with the combination of several metal ions including platinum (Pt), chromium (Cr), vanadium (V), and nickel (Ni). The doped TiO_2 materials were synthesized by standard sol-gel methods with doping levels of 0.1 to 0.5 at.%. The resulting materials were characterized by x-ray diffraction (XRD), BET surface-area measurement, scanning electron microscopy (SEM), and UV-vis diffuse reflectance spectroscopy (DRS). The visible light photocatalytic activity of the codoped samples was quantified by measuring the rate of the oxidation of iodide, the rate of degradation of methylene blue (MB), and the rate of oxidation of phenol in aqueous solutions at λ > 400 nm. 0.3 at.% Pt-Cr-TiO_2 and 0.3 at.% Cr-V-TiO_2 showed the highest visible light photocatalytic activity with respect to MB degradation and iodide oxidation, respectively. However, none of the codoped TiO_2 samples were found to have enhanced photocatalytic activity for phenol degradation when compared to their single-doped TiO_2 counterparts.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1557/JMR.2010.0024 DOIArticle
ORCID:
AuthorORCID
Hoffmann, Michael R.0000-0002-0432-6564
Additional Information:© 2010 Materials Research Society. Received 19 May 2009; accepted 2 July 2009. We gratefully acknowledge the generous support for this research that has been provided by the Northrop-Grumman Corporation. In particular, we would like to give special credit to Dr. Ronald Pirich for his enthusiastic encouragement and intellectual support for our joint projects over the years.
Funders:
Funding AgencyGrant Number
Northrop-Grumman CorporationUNSPECIFIED
Record Number:CaltechAUTHORS:20100216-135225451
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20100216-135225451
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:17488
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:17 Feb 2010 00:25
Last Modified:14 Dec 2015 19:43

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